25 июля 2019 г. 2:28:26 GMT+03:00, Stuart Longland <stuartl@xxxxxxxxxxxxxxxxxx> пишет:
On 25/7/19 9:01 am, vitalif@xxxxxxxxxx wrote:60 millibits per second? 60 bits every 1000 seconds? Are you serious?
Or did we get the capitalisation wrong?
Assuming 60MB/sec (as 60 Mb/sec would still be slower than the 5MB/sec I
was getting), maybe there's some characteristic that Bluestore is
particularly dependent on regarding the HDDs.
I'll admit right up front the drives I'm using were chosen because they
were all I could get with a 2TB storage capacity for a reasonable price.
I'm not against moving to Bluestore, however, I think I need to research
it better to understand why the performance I was getting before was so
poor.
It's a nano-ceph! So millibits :) I mean 60 megabytes per second, of
course. My drives are also crap. I just want to say that you probably
miss some option for your VM, for example "cache=writeback".
cache=writeback should have no effect on read performance but could be
quite dangerous if the VM host were to go down immediately after a write
for any reason.
While 60MB/sec is getting respectable, doing so at the cost of data
safety is not something I'm keen on.
--
With best regards,
Vitaliy Filippov
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